Publisher: DK ISBN 13: 9781409355717. Title: Help Your Kids with Maths Item Condition: used item in a very good condition. Used-like N : The book pretty much look like a new book. There will be no stains or markings on the book, the cover is clean and crisp, the book will look unread, the only marks there may be are slight bumping marks to the edges of the book where it may have been on a shelf previously.